package servlet.ogrenci;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import siniflar.DersOgrenci;
import siniflar.Donem;
import siniflar.OdevNot;
import siniflar.Ogrenci;
import vt.Veritabani;


public class Odevler extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setCharacterEncoding("UTF-8");
        request.setCharacterEncoding("UTF-8");
        HttpSession oturum = request.getSession();
        
        Boolean ogrenciDurum = (Boolean) oturum.getAttribute("ogrenciDurum");
        if (ogrenciDurum == null) {
            ogrenciDurum = false;
        }

        if(ogrenciDurum){
            ArrayList<OdevNot> odevler = null;
            Ogrenci ogrenci = (Ogrenci)oturum.getAttribute("ogrenci");

            Veritabani vt = new Veritabani();
//            Donem donem = new Donem();
//            donem = vt.donemVer(1);
            odevler = vt.ogrenciOdevleriVer(ogrenci);
            oturum.setAttribute("ogrenciOdevler", odevler);
            // bir sorun yoksa diğer sayfaya bilgileri gönder
            if (odevler.size() > 0) {
                oturum.setAttribute("ogrenciDurum", true);
                yonlendir(request, response, "odev.jsp");
                return;
            } else {
                oturum.setAttribute("ogrenciOdevDurum", "Son dönemde alınan derslere ait ödev "
                        + "bulunmadığından ödev görüntüleme yapılamıyor.");
                yonlendir(request, response, "odev.jsp");
                return;
            }
        }
        else{
            oturum.setAttribute("hata", "Hatalı öğrenci numarası veya şifre girdiniz.");
            oturum.setAttribute("ogrenciDurum", false);
            yonlendir(request, response, "giris.jsp");
            return;
        }
    }
    
    public void yonlendir(HttpServletRequest request, HttpServletResponse response, String adres)
            throws ServletException, IOException {
        RequestDispatcher dispatcher = request.getRequestDispatcher(adres);
        dispatcher.forward(request, response);
    }
    
    private boolean ilkGirisMi(String kontrolEdilen){
        // sayfaya ilk giriş mi?
        if(kontrolEdilen == null){
            // evet!
            return true;
        }
        // hayir
        return false;
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
